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  1. yamete389

    a requirement from NFPA 13 bothers me a lot since I want to know the fundamental reason of it

    It says in NFPA 13 that the air supply shall have a capacity capable of restoring normal air pressure in the system within 30 minutes.So where does this "30-minutes" comes from?? is it a time interval relevant to the time of fire duration or this "30-minutes" just exists in this code for nothing?

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